added header comment to artifacts generated by metamodel generator

Author: mhuster23

metamodel-generator/src/main/kotlin/org/modelix/metamodel/generator/MetaModelGenerator.kt

@@ -13,6 +13,8 @@ private val reservedPropertyNames: Set<String> = setOf(
 
 class MetaModelGenerator(val outputDir: Path) {
 
+    private val headerComment = "\ngenerated by modelix metamodel generator\n"
+
     private fun FileSpec.write() {
         writeTo(outputDir)
     }
@@ -38,6 +40,7 @@ class MetaModelGenerator(val outputDir: Path) {
             .build()
 
         FileSpec.builder(typeName.packageName, typeName.simpleName)
+            .addFileComment(headerComment)
             .addType(cls)
             .build()
             .write()
@@ -47,7 +50,8 @@ class MetaModelGenerator(val outputDir: Path) {
         for (language in languages.getLanguages()) {
             language.language.packageDir().toFile().listFiles()?.filter { it.isFile }?.forEach { it.delete() }
             val builder = FileSpec.builder(language.language.generatedClassName().packageName, language.language.generatedClassName().simpleName)
-            val file = builder.addType(generateLanguage(language)).build()
+            val file = builder.addFileComment(headerComment)
+                .addType(generateLanguage(language)).build()
             for (concept in language.getConceptsInLanguage()) {
                 generateConceptFile(concept)
             }
@@ -75,6 +79,7 @@ class MetaModelGenerator(val outputDir: Path) {
 
     private fun generateConceptFile(concept: LanguageSet.ConceptInLanguage) {
         FileSpec.builder(concept.language.name, concept.concept.name)
+            .addFileComment(headerComment)
             .addType(generateConceptObject(concept))
             .addType(generateConceptWrapperInterface(concept))
             .addType(generateConceptWrapperImpl(concept))